ESP8266 Community Forum

Posted: **Tue Jun 30, 2015 10:09 pm**

Has anyone experimented with the Neo6m GPS module and the esp?

I'm attempting to get it to work with an esp12. I'm getting data, but something wrong with it. I'm just getting bunch of numbers, I was expecting a series of NMEA strings.

It works with a serial port. So the way I've been doing it is to upload my sketch via my ftdi, then turn off the esp, switch the ftdi's wire from gpio1 (tx) to gpio 2 which is serial1. Then I plug in the gps to gpio1 and gpio3 and fire it up using the tiny++ gps libary.

I was just getting INVALID messages from the tiny++ gps library, so I tried debugging it by just reading the serial data directly. It just looks like this:
149138192223190238642161317432810196185238238731491367212237025548111128140132741961852382387314913672140157168173173253173661731

I was expecting something like this:

$GPGGA,124519,2807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47

Does anyone have any suggestions on what I should try?

Steve

Posted: **Wed Jul 01, 2015 12:10 am**

What I just discovered is that if I plug the gps module right into the ftdi with a 3.3v VCC and open up the serial monitor, I get the NEMA codes i was expecting, like this:

$GPRMC,,V,,,,,,,,,,N*53
$GPVTG,,,,,,,,,N*30
$GPGGA,,,,,,0,00,99.99,,,,,,*48
$GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30
$GPGLL,,,,,,V,N*64

So that's telling me the gps module itself is working correctly. So either my wiring is wrong on the esp12 or my code is.

Posted: **Wed Jul 01, 2015 1:08 am**

AWWW yeah! I got it working, thanks to rheslip! Thanks for the help. For anyone interested.... You need http://arduiniana.org/libraries/tinygpsplus/

Code: Select all

#include <TinyGPS++.h>
static const uint32_t GPSBaud = 9600;
TinyGPSPlus gps;

void setup() {
  Serial1.begin(115200);
  Serial.begin(GPSBaud, SERIAL_8N1);
  
  Serial1.println("GPS example");
  Serial1.println(TinyGPSPlus::libraryVersion());
}


static char sentence[80],c;  // NMEA sentence from external device
static int line= 0; // data available flag
static int i=0;
static long timer=0;

void loop() {
  readGPS();
}

void readGPS(){
  int j;
  if (Serial.available() > 0) {
    c=Serial.read();
    sentence[i]=c; 
    ++i;
    if (c== 0x0d) line=1; 
  }
  if (i > 79) i=79;  // line too long
  if (line) {
    for (j=0; j<i;++j) {
      //Serial1.print(sentence[j]);
    }
    Serial1.println(sentence);
    gps.encode(*sentence);
    displayInfo();

    line=i=0; // reset the sentence buffer
  }
}


void displayInfo()
{
  Serial1.print(F("Location: ")); 
  if (gps.location.isValid())
  {
    Serial1.print(gps.location.lat(), 6);
    Serial1.print(F(","));
    Serial1.print(gps.location.lng(), 6);
  }
  else
  {
    Serial1.print(F("INVALID"));
  }

  Serial1.print(F("  Date/Time: "));
  if (gps.date.isValid())
  {
    Serial1.print(gps.date.month());
    Serial1.print(F("/"));
    Serial1.print(gps.date.day());
    Serial1.print(F("/"));
    Serial1.print(gps.date.year());
  }
  else
  {
    Serial1.print(F("INVALID"));
  }

  Serial1.print(F(" "));
  if (gps.time.isValid())
  {
    if (gps.time.hour() < 10) Serial1.print(F("0"));
    Serial1.print(gps.time.hour());
    Serial1.print(F(":"));
    if (gps.time.minute() < 10) Serial1.print(F("0"));
    Serial1.print(gps.time.minute());
    Serial1.print(F(":"));
    if (gps.time.second() < 10) Serial1.print(F("0"));
    Serial1.print(gps.time.second());
    Serial1.print(F("."));
    if (gps.time.centisecond() < 10) Serial1.print(F("0"));
    Serial1.print(gps.time.centisecond());
  }
  else
  {
    Serial1.print(F("INVALID"));
  }

  Serial1.println();
}

Posted: **Sat Aug 15, 2015 4:18 am**

Great to hear! I've been researching a project using the neo-6m, esp8266 and tinygpsplus arduino library. Glad they all work together.

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